Notice the design details like the concave bottom between the fins, the stepped deck (very common in windsurfing - my main sport), etc.

I feel like a lot of the boards I see use one part or the other, but not all. Take the parallel rail line - I feel like I see this on "beginner" or "big guy" boards, but not on something that is intended to be super-high-performance (with some exceptions).

Also feel the thickness and stepped deck is often lacking.

I'd love to have something like the board in the blog link above, in a 4'6-5' ish length, 2" thick in the center, dropping to 1" at the rails, glassed in fins, the entire bottom and fins sanded with 600 grit to break the surface tension - just something insanely fast that still turns well enough (with the speed, the idea would be to turn it off the lip with only the back 1/3 in the water - so in theory it turns like a fish).